Mercedes W203 W210 W211 Radiator Expansion Tank Cap A2105010515

Mercedes W203 W210 W211 Radiator Expansion Tank Cap is an original cooling system component designed for C-Class and E-Class models, ensuring proper pressure maintenance in the expansion tank. Thanks to its factory design tailored to the specifics of the Mercedes cooling system, the cap guarantees stable engine operation under various operating conditions. This is a practical service solution for users who want to maintain compliance with the manufacturer's factory standards.

Specifications and technical data

• SKU: A2105010515
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2105010715
• Substitutable numbers: A2105010515, A 210 501 05 15
• Category: Caps

Purpose and function of the expansion tank cap

The Mercedes W203 W210 W211 Radiator Expansion Tank Cap is responsible for maintaining the correct pressure in the cooling system and sealing the tank. A properly selected component of this type:

• stabilizes coolant operating parameters,
• reduces the risk of engine overheating,
• prevents uncontrolled coolant loss,
• supports the safe operation of the entire cooling system in daily use.

The original cap is structurally matched to the geometry of the expansion tank in the mentioned Mercedes generations, which facilitates installation and ensures proper seal fitment.

Compatibility with Mercedes W203, W210, W211 models

The presented component has been designed for popular Mercedes C-Class and E-Class models, allowing it to be used as a replacement for the factory cap in W203, W210, and W211 series vehicles. This allows the user to restore the correct operation of the cooling system without the need for universal solutions, which often do not provide a proper fit.

In the case of service work on the cooling system – such as replacing the tank, flushing the system, or repairing leaks – using an original cap allows you to maintain the parameters specified by the vehicle manufacturer.

Characteristics of the used component

The offered cap comes from the Covers category and is a used item, which means it was previously operated in a vehicle. This type of part can be a cost-effective solution in situations where the priority is to restore system efficiency while maintaining compliance with the factory design. The used component retains the original geometry and operating method intended for the Mercedes cooling system.

Choosing an original Mercedes component allows you to avoid problems with thread fitment, sealing, or cap height, which is important for proper venting and maintaining pressure in the expansion tank.

Service application and benefits of installation

Installing the expansion tank cap in W203, W210, and W211 models is a typical service operation performed, among others, when:

• leaks are detected in the area of the cap,
• there are problems with maintaining pressure in the cooling system,
• replacing the expansion tank with another unit,
• performing preventive maintenance of the cooling system after major repairs.

Using an original cap helps maintain predictable cooling system behavior, which translates into more stable engine operating temperatures and reduces the risk of failures related to overheating.

If you are planning a comprehensive repair or upgrade of the engine bay area in your Mercedes and need other elements from the same group, such as covers, overlays, or additional trims, check out the available parts in the Mercedes Covers category.